Taking things from a technical aspect with no fan coolaid involved, the Quadralink has excellent roll steer characteristics and a slightly more stable (vertically) roll center than the G-Bar. The G Bar is
much easier to install, is less expensive, has better anti squat (easier to put power to the ground) and has two optional anti roll bars, including a 3 way adj. frame mounted one. This gives you many more tuning options and allows you to get hardcore wheel rates with more suple spring rates and a better ride. Both use rubber bushings, G Bar uses some poly g. also. The G Bar can be upgraded with SC&C billet double adj. arms with greasable forged Johnny Joints which are offset inboard for even more tire clearance, have better lateral axle location capabilities and save weight. They look cool too.

Mark SC&C